<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>iframe观看页</title>
    <style>
        .iframe-container {
            width: 1205px;
            /* height: 858px;
            margin-top: -200px; */
            height: 658px;
        }
        body {
            background: #f5f5f5;
        }
    </style>
</head>
<body>
    
    正常iframe
    <div class="iframe-container">
        <iframe src="/watch/3841783" width="100%" height="100%" allowfullscreen frameborder="0" scrolling="no"></iframe>
    </div>

    <script>
        var iframeWindow = document.querySelector('iframe').contentWindow
        
        setInterval(function () {
            iframeWindow.document.documentElement.scrollTop = 200
        }, 1000)
    </script>
</body>
</html>
